To make electrochromic windows change color, what is applied to the window glass?

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To make electrochromic windows change color, what is applied to the window glass?

A.Electricity.

B.Tungsten oxide.

C.A battery.

D.A voltage.

参考答案:

B解析:第五段第二句提供了答案。A sheet of glass coated with thin layers of chemical compound such as tungsten oxide中的coated是“涂上一层薄薄的……,”的意思。